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@dancingtreefrog Got you how.
In order to investigate such cases #AndStatus logs are needed: they will allow to tell, why the app still thinks that the Note (Activity) was not sent.
But probably a network problem occured during sending, and the app didn't get confirmation from a server about successful Note creation on a server.
I thought that this should be a Server's responsibility to deduplicate/resolve such cases, and e.g. seeing that AndStatus client sends the same Note...